JP2017009127A - refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator capable of quickly cooling a first storage chamber when the first storage chamber for performing freezing preservation of stored objects and a second storage chamber for performing refrigerating preservation of stored objects are at high load.SOLUTION: A refrigerator includes: a freezing chamber opened/closed by a door; and a refrigeration chamber opened/closed by a door. The refrigerator includes: a normal cooling mode for, when the temperature in the refrigeration chamber becomes equal to or higher than a first refrigeration start temperature Rb1, starting cold air supply into the refrigeration chamber, and when the temperature becomes equal to or lower than a first refrigeration stop temperature Ra1, stopping the cold air supply; and a high load time cooling mode for, when the temperature in the refrigeration chamber becomes equal to or higher than a second refrigeration start temperature Rb2, starting cold air supply into the refrigeration chamber and when the temperature becomes equal to or lower than a second refrigeration stop temperature R2 which is lower than the first refrigeration start temperature Rb1 and higher than the first refrigeration stop temperature Ra1, stopping the cold air supply. In a predetermined time Ta of the normal cooling mode, when the door of the freezing chamber is opened for equal to or longer than a first opening time T1 and the door of the refrigeration chamber is opened for equal to or longer than a second opening time T2, the normal cooling mode is shifted to the high load time cooling mode.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a refrigerator that cools a first storage chamber that stores a stored product in a frozen state and a second storage chamber that stores the stored product in a refrigerator by operating a refrigeration cycle.

  A conventional refrigerator is disclosed in Patent Document 1. This refrigerator has a refrigerator compartment at the top and a freezer compartment below the refrigerator compartment. A first cold air passage and a second cold air passage extending vertically are formed independently of each other behind the freezer compartment and the refrigerator compartment. A first cooler and a second cooler are arranged in the first cool air passage and the second cool air passage, respectively, and discharge ports for discharging cool air to the freezer compartment and the refrigerator compartment are respectively opened. A blower is disposed in each of the first cold air passage and the second cold air passage.

  A machine room is provided at the rear lower end of the refrigerator, and a compressor is arranged in the machine room. The compressor is connected to the first cooler and the second cooler to operate the refrigeration cycle. A switching valve that switches the flow path of the refrigerant between the first cooler and the second cooler is disposed in the refrigerant passage connecting the compressor, the first cooler, and the second cooler.

  In the refrigerator configured as described above, when the temperature in the freezer compartment exceeds a predetermined freezing start temperature, the compressor is driven, and the refrigerant is circulated to the first cooler by switching the switching valve. The cold air generated by heat exchange in the first cooler flows through the first cold air passage by driving the blower and then flows into the freezer compartment from the discharge port. Thereby, the freezer compartment is cooled.

  Moreover, when the temperature in the refrigerator compartment exceeds a predetermined refrigerator start temperature, the compressor is driven, and the refrigerant is circulated through the second cooler by switching the switching valve. The cold air generated by heat exchange in the second cooler flows through the second cold air passage by driving the blower and then flows into the refrigerator compartment from the discharge port. Thereby, the refrigerator compartment is cooled.

  Further, if the door of the freezer compartment is opened when the temperature of the room in which the refrigerator is installed is higher than a predetermined temperature, it is determined that the freezer compartment is in a high load state and the refrigeration start temperature of the refrigerator compartment is raised. Thereby, the refrigerant | coolant flow to a 2nd cooler is suppressed, a freezer compartment is cooled preferentially rather than a refrigerator compartment, and melting | fusing of frozen food etc. can be prevented.

JP 2009-133503 A (pages 6 to 8, FIGS. 6 to 8)

  However, according to the conventional refrigerator, when food or the like is put into both the refrigerator compartment and the freezer compartment, the temperature of the refrigerator compartment exceeds the refrigeration start temperature. Thereby, a refrigerant | coolant distribute | circulates alternately to a 1st cooler and a 2nd cooler, and cooling of a refrigerator compartment and a freezer compartment is performed. For this reason, there has been a problem that cooling of the freezer compartment is delayed and melting of frozen foods and the like cannot be prevented.

  An object of this invention is to provide the refrigerator which can cool a 1st store room rapidly at the time of the high load of the 1st store room which preserve | saves a store thing frozen, and the 2nd store room which preserve | saves a store item refrigerated.

In order to achieve the above object, the present invention provides a first storage chamber that is opened and closed by a first door to store stored items in a frozen state, a second storage chamber that is opened and closed by a second door to store stored items in a refrigerated state, In a refrigerator comprising: a compressor that operates a cycle; and a cooling device that is connected to the compressor and generates cold air that is supplied to the first storage chamber and the second storage chamber.
When the temperature in the second storage chamber becomes equal to or higher than the predetermined first refrigeration start temperature, the supply of cold air to the second storage chamber is started and the temperature becomes lower than the predetermined first refrigeration stop temperature lower than the first refrigeration start temperature. A normal cooling mode in which the cold air supply to the second storage chamber is stopped when
When the temperature in the second storage chamber becomes equal to or higher than a predetermined second refrigeration start temperature, the supply of cold air to the second storage chamber is started, and the predetermined temperature is lower than the second refrigeration start temperature and higher than the first refrigeration stop temperature. A high-load cooling mode for stopping the supply of cold air to the second storage chamber when the temperature is equal to or lower than the second refrigeration stop temperature;
When the first door is opened for a predetermined first opening time or more and the second door is opened for a predetermined second opening time or more within a predetermined time in the normal cooling mode, the mode is shifted to the high load cooling mode. It is characterized by that.

  In the refrigerator having the above-described configuration, it is preferable that the rotation speed of the compressor in the high-load cooling mode is greater than the rotation speed of the compressor in the normal cooling mode.

  In the refrigerator having the above-described configuration, it is preferable that when the first door or the second door is opened in the high load cooling mode, the rotation speed of the compressor is increased.

  In the refrigerator having the above-described configuration, it is preferable that the second refrigeration start temperature is higher than the first refrigeration start temperature.

  According to the present invention, in the refrigerator configured as described above, in the normal cooling mode, the compressor starts to be driven when the temperature in the first storage chamber becomes equal to or higher than a predetermined first freezing start temperature, and the first storage chamber The compressor is stopped when the temperature becomes equal to or lower than a predetermined first refrigeration stop temperature lower than the first refrigeration start temperature, and in the high load cooling mode, the temperature in the first storage chamber is a predetermined first temperature. The predetermined second refrigeration stop temperature at which the temperature of the first storage chamber is lower than the second refrigeration start temperature and higher than the first refrigeration stop temperature while starting to drive the compressor when the temperature becomes equal to or higher than the second refrigeration start temperature. It is preferable to stop the driving of the compressor when the following condition is reached and shift to the normal cooling mode when the compressor stops a predetermined number of times during the high load cooling mode.

  Moreover, this invention WHEREIN: In the refrigerator of the said structure, when a 2nd freezing start temperature is made higher than a 1st freezing start temperature, it is preferable.

  According to the present invention, in the refrigerator having the above-described configuration, the cooling device is disposed and the first cold air passage through which the cold air discharged into the first storage chamber and the second storage chamber flows, and the first cold air passage through the damper. It is preferable that a second cold air passage that communicates and discharges cold air into the second storage chamber is provided, and the supply of cold air to the second storage chamber is stopped and the supply of cold air is stopped by opening and closing the damper.

  According to the present invention, in the refrigerator configured as described above, the cooling device includes a first cooler that generates cold air to be supplied to the first storage chamber, and a second cooler that generates cold air to be supplied to the second storage chamber. And it is preferable to provide the switching valve which switches the flow path of a refrigerant | coolant to one or both of a 1st cooler and a 2nd cooler.

  According to the present invention, when the first door of the first storage chamber is opened for the first opening time and the second door of the second storage chamber is opened for the second opening time within a predetermined time in the normal cooling mode, the high load cooling mode is set. Migrate to In the high load cooling mode, the temperature at which the cooling air supply to the second storage chamber is stopped is set to the second refrigeration stop temperature that is higher than the first refrigeration stop temperature in the normal cooling mode. Thereby, the cooling of the second storage chamber is finished early in the high load cooling mode, and the first storage chamber is cooled. Therefore, the first storage chamber can be quickly cooled when the first storage chamber and the second storage chamber are subjected to high loads.

The front view which shows the refrigerator of 1st Embodiment of this invention. Sectional drawing on the right side showing the refrigerator according to the first embodiment of the present invention. The block diagram which shows the structure of the refrigerator of 1st Embodiment of this invention. The flowchart which shows operation | movement of the normal cooling mode of the refrigerator of 1st Embodiment of this invention. The flowchart which shows the determination operation | movement of the refrigerator of 1st Embodiment of this invention. The time chart which shows the opening / closing operation | movement of the refrigerator compartment of the refrigerator of 1st Embodiment of this invention, and the door of a freezer compartment The flowchart which shows operation | movement of the high load cooling mode of the refrigerator of 1st Embodiment of this invention. The time chart which shows operation | movement of the refrigerator of 1st Embodiment of this invention. Sectional drawing on the right side showing the refrigerator of the second embodiment of the present invention The time chart which shows operation | movement of the refrigerator of 3rd Embodiment of this invention.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG.1 and FIG.2 has each shown the front view and right side sectional drawing of the refrigerator of 1st Embodiment. In FIG. 2, the arrows indicate the flow of cold air. The refrigerator 1 has a heat insulating box 1a filled with a foam heat insulating material 9 such as urethane foam between an outer box 1b formed of a coated steel plate or the like and an inner box 1c formed of a resin molded product.

  The refrigerator compartment 2 is formed in the upper part of the refrigerator 1 by the heat insulation box 1a. Below the refrigerating room 2, an ice making room 3 and a freezing room 4 arranged side by side are arranged via a partition wall 30 filled with a heat insulating material. A freezing room 5 is disposed below the ice making room 3 and the freezing room 4. Below the freezer compartment 5, the vegetable compartment 6 is arranged through the partition wall 31 filled with the heat insulating material. The ice making chamber 3, the freezing chamber 4 and the freezing chamber 5 communicate with each other inside, and the refrigeration chamber 2 and the vegetable chamber 6 communicate with each other via a communication path (not shown). Note that the volume of the freezer compartment 4 is smaller than the volume of the freezer compartment 5.

  The refrigerator compartment 2 is opened and closed by doors 2b and 2c (see FIG. 1) that rotate about the right end and the left end, respectively. In the following description, the doors 2b and 2c may be collectively referred to as “door 2a”. A display unit 70 including operation buttons (not shown) and a plurality of indicators (not shown) is provided on the front surface of the door 2c. The operation setting of the refrigerator 1 can be performed by operating the operation buttons.

  The refrigerating chamber 2 is provided with a plurality of stages (four stages in the present embodiment) on the top and bottom of the storage shelves 20 on which stored items are placed. The mounting shelf 20 is supported by a support member (not shown) provided on the side wall of the refrigerator compartment 2 so that it can be pulled out. A case 40 having an open upper surface is disposed below the lowermost mounting shelf 20 so that it can be pulled out. The case 40 is formed of, for example, a resin, and stored items are taken in and out through an opening on the upper surface. In addition, a plurality of storage pockets 45 (two in this embodiment) are provided on the back surface of the door 2a in the vertical direction for storing stored items.

  The ice making room 3, the freezing room 4, the freezing room 5 and the vegetable room 6 are opened and closed by a drawer type door 3a, door 4a, door 5a and door 6a, respectively. Storage cases 3b (not shown), 4b, 5b, 6b for storing stored items are attached to the rear surfaces of the doors 3a, 4a, 5a, 6a, respectively, and storage cases 5c, 6c are provided above the storage cases 5b, 6b, respectively. Is placed. Thus, when the doors 3a, 4a, 5a, 6a are opened, the storage cases 3b, 4b, 5b, 5c, 6b, 6c are pulled out forward.

  Door sensors 22, 23, and 25 (see FIG. 3) that detect opening and closing are provided on the door 2a, the door 3a, and the door 5a, respectively. In addition, temperature sensors 26 and 56 for detecting temperatures in the refrigerator compartment 2 and the freezer compartment 5 are installed at the rear part of the refrigerator compartment 2 and the rear part of the freezer compartment 5, respectively.

  A cold air passage 11 (first cold air passage) extending vertically is provided behind the ice making chamber 3 and the freezing chambers 4 and 5. The cold air passage 11 is partitioned from the ice making chamber 3 and the freezing chambers 4 and 5 by a back plate 13, and a return port 11 b and a plurality of discharge ports 11 a are opened in the back plate 13.

  A cold air passage 12 (second cold air passage) extending vertically is provided on the back wall surface of the refrigerator compartment 2, and the cold air passage 12 communicates with the cold air passage 11 via a damper 15. The cold air passage 12 has a plurality of discharge ports 12 a that face the refrigerator compartment 2.

  A machine room 50 is provided behind the lower part of the vegetable room 6. A compressor 51 is disposed in the machine room 50. The compressor 51 can vary the number of rotations (range of 20 Hz to 70 Hz at the operating frequency) in a range of 1200 rpm to 4200 rpm, for example. A condenser, an expander (all not shown) and a cooler 7 (cooling device) are sequentially connected to the compressor 51, and a refrigerant such as isobutane is circulated by driving the compressor 51 to operate a refrigeration cycle. Thereby, the cooler 7 becomes the low temperature side of the refrigeration cycle.

  The cooler 7 is disposed in the cool air passage 11, and a blower 8 is provided above the cooler 7. The cooler 7 generates cool air by heat exchange, and the cool air flows through the cool air passage 11 by driving the blower 8. Then, cold air flows into the ice making chamber 3 and the freezing chambers 4 and 5 through the discharge port 11a. As a result, the freezing rooms 4 and 5 store the stored items in a frozen state, and the ice making room 3 is set to a temperature below the freezing point, and ice making is performed by an automatic ice making device (not shown).

  The cold air flowing through the cold air passage 11 flows into the cold air passage 12 via the damper 15. The cold air flowing through the cold air passage 12 flows into the refrigerator compartment 2 through the discharge port 12a. Thereby, the refrigerator compartment 2 refrigerates and stores the stored items. The cold air that has circulated in the refrigerator compartment 2 flows into the vegetable compartment 6 via a communication path (not shown). Thereby, the vegetable compartment 6 refrigerates and preserves vegetables and the like at a higher temperature than the refrigerator compartment 2.

  A defrost heater 60 that defrosts the cooler 7 is disposed below the cooler 7 in the cool air passage 11. A drain pipe (not shown) that communicates the cold air passage 11 and the machine room 50 is provided below the defrost heater 60, and an evaporating dish (not shown) is disposed in the machine room 50.

  When a predetermined defrost start condition is satisfied, the defrost heater 60 is energized. Thereby, the frost adhering to the cooler 7 is melted, and the defrost water dripped from the cooler 7 is guided to the evaporating dish through the drain pipe. The defrost water collected in the evaporating dish evaporates due to heat generated by the compressor 51 and the like.

  The refrigerator 1 has a normal cooling mode and a high-load cooling mode described later. In the normal cooling mode, when the predetermined cooling start condition is satisfied, the compressor 51 is driven to cool the refrigerator compartment 2, the freezer compartments 4, 5, and the ice making chamber 3. When the door 2a and the door 5a are opened under a predetermined opening / closing condition described later (see FIG. 6), the normal cooling mode is shifted to the high load cooling mode, and the cooling of the refrigerator compartment 2 is stopped in the high load cooling mode. Make the temperature higher than in normal cooling mode.

  Each indicator of the operation unit 70 is lit to notify the normal cooling mode or the high load cooling mode. Thereby, the user can easily recognize the execution of the normal cooling mode or the high load cooling mode.

  FIG. 3 is a block diagram showing the configuration of the refrigerator 1. The refrigerator 1 includes a control unit 100 including a CPU, and the control unit 100 controls each unit of the refrigerator 1. A compressor 51, a damper 15, temperature sensors 26 and 56, door sensors 22, 23 and 25, and a storage unit 38 are connected to the control unit 100, respectively. The storage unit 38 stores a control program for the refrigerator 1 and stores a calculation result by the control unit 100.

  FIG. 4 is a flowchart showing the operation in the normal cooling mode of the refrigerator 1 configured as described above. When the refrigerator 1 is turned on, in step # 11, the process waits until the temperature F in the freezer compartment 5 becomes equal to or higher than a predetermined first freezing start temperature Fb1 (for example, −18 ° C.). When the temperature F becomes equal to or higher than the first freezing start temperature Fb1, the process proceeds to step # 12.

  In step # 12, the compressor 51 is driven at the first rotation speed H1 (for example, 1800 rpm). At this time, the blower 8 is driven, and the cold air generated by heat exchange in the cooler 7 flows through the cold air passage 11 and flows into the freezing chambers 4 and 5 and the ice making chamber 3 through the discharge port 11a. Thereby, the freezing rooms 4 and 5 and the ice making room 3 are cooled.

  In step # 13, it is determined whether or not the temperature R in the refrigerator compartment 2 has become equal to or higher than a predetermined first refrigerator start temperature Rb1 (for example, 4 ° C.). When the temperature R is equal to or higher than the first refrigeration start temperature Rb1, the process proceeds to step # 14. When the temperature R is not equal to or higher than the first refrigeration start temperature Rb1, the process proceeds to step # 15.

  In step # 14, the damper 15 is opened. Thereby, a part of the cold air flowing through the cold air passage 11 flows into the cold air passage 12 via the damper 15. The cold air flowing through the cold air passage 12 flows into the refrigerator compartment 2 through the discharge port 12a. Thereby, the refrigerator compartment 2 and the vegetable compartment 6 are cooled.

  In step # 15, it is determined whether or not the damper 15 is open. If the damper 15 is open, the process proceeds to step # 16. If the damper 15 is closed, the process proceeds to step # 18.

  In step # 16, it is determined whether or not the temperature R has become equal to or lower than a predetermined first refrigeration stop temperature Ra1 (for example, 1 ° C.). When the temperature R becomes equal to or lower than the first refrigeration stop temperature Ra1, the process proceeds to step # 17 and the damper 15 is closed. When the temperature R is not lower than the first refrigeration stop temperature Ra1, the process proceeds to step # 18.

  In step # 18, it is determined whether or not the temperature F has become equal to or lower than a predetermined first freezing stop temperature Fa1 (for example, −21 ° C.). When the temperature F becomes equal to or lower than the first refrigeration stop temperature Fa1, the process proceeds to step # 19, where the compressor 51 is stopped. When the temperature F is not lower than the first refrigeration stop temperature Fa1, the process returns to step # 13.

  In step # 20, it is determined whether or not the damper 15 is open. If the damper 15 is open, the process proceeds to step # 21 and the damper 15 is closed. If not, the process returns to step # 11.

  After step # 21, the process returns to step # 11, and steps # 11 to # 21 are repeated.

  FIG. 5 is a flowchart showing a determination operation for determining a high load in the freezer compartment 2 and the refrigerator compartment 5. When the operation of the refrigerator 1 is started, the operation in the normal cooling mode in FIG. 4 and the determination operation in FIG. 5 are performed in parallel. In step # 71, the system waits until the freezer compartment 2 and the refrigerator compartment 5 become high loads. When the load becomes high, the routine proceeds to step # 72 and the high load cooling mode is executed. After step # 72, the process returns to step # 71, and step # 71 and step # 72 are repeated.

  FIG. 6 shows a time chart for explaining the high load determination at step # 71 of FIG. FIGS. 6A and 6B show examples of opening and closing of the doors 5a and 2a, respectively. When the door 5a is opened for a predetermined first opening time T1 (for example, 2 minutes) or more and the door 2a is opened for a predetermined second opening time T2 (for example, 1 minute) or more within a predetermined time Ta (for example, 4 minutes). In Step # 71 of FIG. 5, it is determined that the freezer compartment 2 and the refrigerator compartment 5 are heavily loaded. The first opening time T1 and the second opening time T2 may be the same or different.

  It should be noted that the times when the doors 2a and 5a are opened within the predetermined time Ta are integrated, respectively, and if the respective integrated times are equal to or longer than the first opening time T1 and the second opening time T2, freezing is performed at step # 71 of FIG. You may judge that the chamber 2 and the refrigerator compartment 5 became high load. Moreover, you may judge that the freezer compartment 2 and the refrigerator compartment 5 became high load, when the doors 5a and 2a open at the same time. In the example of FIG. 6, the door 2a may be opened earlier than the door 5a, and the second opening time T2 may be the same as the time until the door 2a is opened and closed.

  FIG. 7 is a flowchart showing the operation in the high load cooling mode in step # 72 of FIG. In step # 51, it waits until the temperature F in the freezer compartment 5 becomes more than predetermined 2nd freezing start temperature Fb2 (for example, -17 degreeC). The second freezing start temperature Fb2 in the high load cooling mode is set to a temperature higher than the first freezing start temperature Fb1 in the normal cooling mode. When the temperature F becomes equal to or higher than the second freezing start temperature Fb2, the process proceeds to step # 52.

  In step # 52, the compressor 51 is driven at the second rotation speed H2 (for example, 2100 rpm). That is, in the high load cooling mode, the compressor 51 is driven at a higher rotational speed than in the normal cooling mode. At this time, the blower 8 is driven as in the normal cooling mode, and cold air flows into the refrigerator compartment 2, the freezer compartments 4, 5, and the ice making compartment 3.

  The second rotational speed H2 may be the same rotational speed as the first rotational speed H1. Thereby, the increase in the power consumption of the refrigerator 1 can be reduced. Further, the second rotational speed H2 may be made larger than the first rotational speed H1 when a predetermined ascent condition is satisfied. Examples of the rising condition include a case where the outside air temperature of the refrigerator 1 is higher than a predetermined upper limit temperature and a case where the temperature increase rate of the temperature F exceeds a predetermined upper limit value.

  In step # 53, it is determined whether or not at least one of the doors 2a and 5a has been opened. When at least one of the doors 2a and 5a is in the open state, the process proceeds to step # 54, and when it is not in the open state, the process proceeds to step # 55.

  In Step # 54, the rotation speed of the compressor 51 is increased to 2400 rpm, for example. Thereby, for example, even when at least one of the doors 2a and 5a is further opened immediately after both the doors 2a and 5a are opened, the freezer compartment 5 can be rapidly cooled.

  In Step # 55, it is determined whether or not the temperature R in the refrigerator compartment 2 has become equal to or higher than a predetermined second refrigerator start temperature Rb2 (for example, 6.5 ° C.). The second refrigeration start temperature Rb2 in the high load cooling mode is set to a temperature higher than the first refrigeration start temperature Rb1 in the normal cooling mode. When the temperature R is equal to or higher than the second refrigeration start temperature Rb2, the process proceeds to step # 56, where the damper 15 is opened. When the temperature R is not equal to or higher than the second refrigeration start temperature Rb2, the process proceeds to step # 57.

  In step # 57, it is determined whether or not the damper 15 is open. If the damper 15 is open, the process proceeds to step # 58, and if not, the process proceeds to step # 60.

  In step # 58, it is determined whether or not the temperature R has become equal to or lower than a predetermined second refrigeration stop temperature Ra2 (for example, 3.5 ° C.). As shown in FIG. 8, the second refrigeration stop temperature Ra2 is set to a temperature higher than the first refrigeration stop temperature Ra1 and lower than the first refrigeration start temperature Rb1 and the second refrigeration start temperature Rb2. When the temperature R becomes equal to or lower than the second refrigeration stop temperature Ra2, the process proceeds to step # 59 and the damper 15 is closed. When the temperature R does not become lower than the second refrigeration stop temperature Ra2, the process proceeds to step # 60.

  In step # 60, it is determined whether or not the temperature F has become equal to or lower than a predetermined second freezing stop temperature Fa2 (for example, −20 ° C.). The second refrigeration stop temperature Fa2 in the high load cooling mode is set to a temperature higher than the first refrigeration stop temperature Fa1 in the normal cooling mode. When the temperature F becomes equal to or lower than the second refrigeration stop temperature Fa2, the process proceeds to step # 61, where the compressor 51 is stopped. When the temperature F is not lower than the second refrigeration stop temperature Fa2, the process returns to step # 55.

  Thereby, for example, when the user puts a load of food or the like into both the refrigerator compartment 2 and the freezer compartment 5, the cooling of the refrigerator compartment 2 is finished early, and thereafter the refrigerator compartment 5 is concentrated and cooled. be able to. Therefore, the freezer compartment 5 can be rapidly cooled at the time of high load, and the melting of frozen foods and the like can be prevented.

  In step # 62, it is determined whether or not the damper 15 is open. If the damper 15 is open, the process proceeds to step # 63 and the damper 15 is closed. If not, the process proceeds to step # 64.

  In step # 64, it is determined whether or not the stop count N of the compressor 51 has reached a predetermined upper limit count Ns (for example, twice) in the high load cooling mode. When the number of stops N reaches the upper limit number Ns, the process proceeds to the normal cooling mode of FIG. 4, and when the upper limit number Ns has not been reached, the process returns to step # 51 and steps # 51 to # 64 are repeated.

  FIG. 8 is a time chart showing the operation of the refrigerator 1. 8A to 8D show examples of transitions of the temperature R in the refrigerator compartment 2, the temperature F in the freezer compartment 5, the on / off state of the compressor 51, and the open / close state of the damper 15, respectively.

  At time t11, the temperature F of the freezer compartment 5 becomes equal to or higher than the first freezing start temperature Fb1, and the compressor 51 is driven at the first rotation speed H1. Further, at time t11, the temperature R of the refrigerating chamber 2 becomes equal to or higher than the first refrigerating start temperature Rb1, and the damper 15 is opened. At time t12, the temperature R becomes equal to or lower than the first refrigeration stop temperature Ra1, and the damper 15 is closed. At time t13, the temperature F becomes equal to or lower than the first freezing stop temperature Fa1, and the compressor 51 is stopped. In the period Ts, the normal cooling mode is executed.

  At time t31, food or the like is charged into the refrigerator compartment 2 and the freezer compartment 5, and the refrigerator compartment 2 and the freezer compartment 5 are subjected to high loads. At time t32, the compressor 51 is driven at the second rotational speed H2, and shifts to the high load cooling mode. At time t33, the temperature R becomes equal to or lower than the second refrigeration stop temperature Ra2, and the damper 15 is closed. At time t34, the temperature F becomes equal to or lower than the second freezing stop temperature Fa2, and the compressor 51 is stopped.

  At time t41, the temperature F becomes equal to or higher than the second freezing start temperature Fb2, and the compressor 51 is driven at the second rotational speed H2. Further, at time t41, the temperature R becomes equal to or higher than the second refrigeration start temperature Rb2, and the damper 15 is opened. At time t42, the temperature R becomes equal to or lower than the second refrigeration stop temperature Ra2, and the damper 15 is closed. At time t43, the temperature F becomes equal to or lower than the second freezing stop temperature Fa2, and the compressor 51 is stopped.

  At time t43, the number of stops N of the compressor 51 reaches the upper limit number Ns (twice), and the refrigerator 1 shifts to the normal cooling mode. Thus, the high load cooling mode is executed in the period Th.

  At time t51, the temperature F becomes equal to or higher than the first freezing start temperature Fb1, and the compressor 51 is driven at the second rotational speed H2. Further, at time t51, the temperature R becomes equal to or higher than the first refrigeration start temperature Rb1, and the damper 15 is opened. At time t52, the temperature R becomes equal to or lower than the first refrigeration stop temperature Ra1, and the damper 15 is closed. At time t53, the temperature F becomes equal to or lower than the first freezing stop temperature Fa1, and the compressor 51 is stopped.

  As shown in FIG. 8, when the compressor 51 is first driven after shifting from the high load cooling mode to the normal cooling mode (time t51), the compressor 51 is driven at the second rotational speed H2. Thereby, the freezer compartment 5 can be cooled rapidly. In this case, the compressor 51 may be driven at the first rotational speed H1.

  According to this embodiment, the door 5a (first door) of the freezing room 5 (first storage room) is opened for the first opening time T1 within a predetermined time Ta in the normal cooling mode, and the refrigerating room 2 (second storage room). When the door 2a (second door) is opened for the second opening time T2, the mode is shifted to the high load cooling mode. In the high load cooling mode, the temperature at which the cooling air supply of the refrigerator compartment 2 is stopped is set to the second refrigeration stopping temperature Ra2 that is higher than the first refrigeration stopping temperature Ra1 in the normal cooling mode. Thereby, the cooling of the refrigerator compartment 2 is completed early at the time of the high load cooling mode, and the freezer compartment 5 is cooled. Therefore, when the freezer compartment 5 and the refrigerator compartment 2 become a heavy load, the freezer compartment 5 can be cooled rapidly, and melting | fusing of frozen food etc. can be prevented.

  Moreover, since the damper 15 is closed early at the time of the high load cooling mode, it is possible to reduce the flow of relatively high-temperature cold air in the refrigerator compartment 2 into the cooler 7. Therefore, the freezer compartment 5 can be rapidly cooled while suppressing an increase in power consumption of the refrigerator 1.

  Further, the second rotation speed H2 of the compressor 51 in the high load cooling mode is set to be larger than the first rotation speed H1 of the compressor 51 in the normal cooling mode. Thereby, the freezer compartment 5 can be cooled more rapidly.

  Further, when the door 5a or the door 2a is opened in the high load cooling mode, the rotational speed of the compressor 51 is increased. Thereby, for example, immediately after the user puts food or the like into the refrigerator compartment 2 and the freezer compartment 5, when the door 2a or door 5a is opened for cooking or the like, the refrigerator compartment 2 or the refrigerator compartment 5 is rapidly cooled. can do. On the other hand, if the doors 2a and 5a are not opened immediately after the user puts food or the like into the refrigerator compartment 2 and the freezer compartment 5, the rotational speed of the compressor 51 does not increase, and thus the power consumption of the refrigerator 1 increases. Can be suppressed.

  Further, the second refrigeration start temperature Rb2 in the high load cooling mode is set higher than the first refrigeration start temperature Rb1 in the normal cooling mode. Thereby, the temperature difference between 2nd refrigeration start temperature Rb2 and 2nd refrigeration stop temperature Ra2 can be made larger than the temperature difference of 1st refrigeration start temperature Rb1 and 2nd refrigeration stop temperature Ra2. Therefore, frequent opening / closing operations of the damper 15 can be reduced, and failure of the damper 15 can be reduced.

  Further, in the high load cooling mode, the driving of the compressor 51 is stopped when the temperature F becomes equal to or lower than the second refrigeration stop temperature Fa2 higher than the first refrigeration stop temperature Fa1. Then, when the number of stops N of the compressor 51 reaches the upper limit number Ns in the high load cooling mode, the mode is shifted to the normal cooling mode. Thereby, since the high load cooling mode can be terminated early and the normal cooling mode can be entered, the stored product can be refrigerated and frozen without hindrance.

  Further, since the second refrigeration stop temperature Ra2 and the second refrigeration stop temperature Fa2 in the high load cooling mode are higher than the first refrigeration stop temperature Ra1 and the second refrigeration stop temperature Fa1 in the normal cooling mode, respectively. Prolonged continuous operation time of the compressor 51 in the high load cooling mode can be reduced. Thereby, adhesion of frost to the cooler 7 can be reduced.

  Further, the second refrigeration start temperature Fb2 in the high load cooling mode is set higher than the first refrigeration start temperature Fb1 in the normal cooling mode. Thereby, frequent ON / OFF of the compressor 51 can be prevented, and the increase in the power consumption of the refrigerator 1 can be suppressed.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 9 shows a right side cross-sectional view of the refrigerator of the present embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. This embodiment is different from the first embodiment in that a cooler 17 is provided in addition to the cooler 7 and the damper 15 is omitted. Other parts are the same as those in the first embodiment.

  The refrigerator compartment 2 is formed in the upper part of the refrigerator 1 by the heat insulation box 1a. A vegetable compartment 6 is disposed below the refrigerator compartment 2 via a partition plate 33. Below the vegetable compartment 6, an ice making chamber 3 and a freezer compartment 4 arranged side by side are arranged via a partition wall 30 filled with a heat insulating material. A freezing room 5 is disposed below the ice making room 3 and the freezing room 4. The ice making chamber 3, the freezing chamber 4 and the freezing chamber 5 communicate with each other inside, and the refrigeration chamber 2 and the vegetable chamber 6 communicate with each other via a communication path (not shown).

  A cold air passage 11 extending vertically is provided behind the ice making chamber 3 and the freezing chambers 4, 5, and a cold air passage 12 extending vertically is provided behind the refrigerator compartment 2 and the vegetable compartment 6. The cold air passages 11 and 12 are formed independently and do not communicate with each other.

  In the cool air passages 11 and 12, a cooler 7 (first cooler) and a cooler 17 (second cooler) are disposed, and blowers 8 and 18 are disposed, respectively. A refrigerant passage (not shown) connecting the compressor 51 and the coolers 7 and 17 is provided with a switching valve (not shown) composed of a three-way valve. The flow path of the refrigerant can be switched to one or both of the coolers 7 and 17 by the switching valve. The cooler 7 generates cool air to be supplied to the ice making chamber 3 and the freezing chambers 4 and 5, and the cooler 17 generates cool air to be supplied to the refrigerating chamber 2. The coolers 7 and 17 constitute a cooling device.

  FIG. 8D shows an example of transition of the switching state of the switching valve instead of the transition of the opening / closing state of the damper 15 of the first embodiment in the present embodiment. “Open” indicates a state in which the refrigerant flows through the coolers 7 and 17 by the switching valve, and “Closed” indicates a state in which the refrigerant flows through the cooler 7 by the switching valve and no refrigerant flows through the cooler 17. Show.

  In step # 14 of FIG. 4, the valve is opened by the switching valve. Thereby, cold air is produced | generated by the cooler 17, and the refrigerator compartment 2 is cooled. In step # 15 and step # 20, it is determined whether or not it is “open”. In step # 17 and step # 20, the switch valve is closed.

  In the present embodiment, in steps # 56, # 59, and # 63 of FIG. 7, the same operations as in steps # 14, # 17, and # 21 of the present embodiment are performed, respectively. Further, in steps # 57 and # 62 of FIG. 7, the same determinations as in steps # 15 and # 20 of the present embodiment are performed, respectively.

  According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, the cooler 7 (first cooler) and the cooler 17 (second cooler) are provided, and one or both of the coolers 7 and 17 are provided with a switching valve for switching the refrigerant flow path. Thereby, the cold air passages 11 and 12 can be made independent of each other, and the relatively high temperature cold air in the refrigerator compartment 2 can be prevented from flowing into the cooler 7 when the refrigerator compartment 2 is cooled. Therefore, it is possible to reduce the increase in power consumption of the refrigerator 1 during the high load cooling mode and cool the freezer compartment 5 more rapidly.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 10 is a time chart showing the operation of the refrigerator of this embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. In the present embodiment, the second refrigeration start temperature Rb2 and the second refrigeration start temperature Fb2 in the high load cooling mode are set to the same temperatures as the first refrigeration start temperature Rb1 and the first refrigeration start temperature Fb1 in the normal cooling mode, respectively. This is different from the first embodiment. Other parts are the same as those in the first embodiment.

  Accordingly, the temperature difference between the second refrigeration start temperature Rb2 and the second refrigeration stop temperature Ra2 and the temperature difference between the second refrigeration start temperature Fb2 and the second refrigeration stop temperature Fa2 of the present embodiment are greater than those of the first embodiment. Becomes smaller. Therefore, the drive time of the compressor 51 in the high load cooling mode can be made shorter than in the case of the first embodiment. As a result, an increase in power consumption of the refrigerator 1 at the time of high load can be reduced.

  However, if the temperature difference between the second refrigeration start temperature Rb2 and the second refrigeration stop temperature Ra2 is reduced, the damper 15 is frequently opened and closed, and the damper 15 may fail. Moreover, if the temperature difference between the second freezing start temperature Fb2 and the second freezing stop temperature Fa2 is reduced, the compressor 51 is frequently turned on and off, and the power consumption of the refrigerator 1 may increase. For this reason, it is desirable to make 2nd refrigeration start temperature Rb2 and 2nd freezing start temperature Fb2 higher than 1st refrigeration start temperature Rb1 and 1st freezing start temperature Fb1, respectively like 1st Embodiment and 2nd Embodiment.

  Also in this embodiment, the same effect as the first embodiment can be obtained. In the second embodiment, the second refrigeration start temperature Rb2 and the second refrigeration start temperature Fb2 in the high load cooling mode are the same as the first refrigeration start temperature Rb1 and the first refrigeration start temperature Fb1 in the normal cooling mode, respectively. The temperature may be set.

  In addition, in 1st Embodiment-3rd Embodiment, it replaces with the door sensors 22 and 25, the door sensor which detects opening / closing of the door 6a of the vegetable compartment 6, and the door 4a of the freezer compartment 4 is provided, and the door 6a and the door 4a are provided. May be opened, and the vegetable compartment 6 and the freezer compartment 4 may be shifted to the high load cooling mode when the load is high. In addition to the door sensors 22, 23, and 25, a door sensor that detects opening and closing of the door 6 a of the vegetable compartment 6 and the door 4 a of the freezer compartment 4 is provided, and the doors 2 a, 4 a, 5 a, 6 a are opened and the refrigerator compartment 2, The freezing compartments 4 and 5 and the vegetable compartment 6 may be shifted to a high-load cooling mode when the load is high.

  In the first to third embodiments, when the temperature F in the freezer compartment 5 is equal to or higher than the first freezing start temperature Fb1 in the normal cooling mode, or the temperature R in the refrigerator compartment 2 is the first refrigeration start temperature. The compressor 51 starts to be driven when the temperature becomes Rb1 or higher, and when the temperature F becomes equal to or lower than the first refrigeration stop temperature Fa1 and when the temperature R becomes equal to or lower than the first refrigeration stop temperature Ra1. May be stopped. In addition, when the temperature F becomes equal to or higher than the second refrigeration start temperature Fb2 or when the temperature R becomes equal to or higher than the second refrigeration start temperature Rb2 in the high load cooling mode, the compressor 51 starts to be driven and the temperature F May stop the compressor 51 when the temperature becomes equal to or lower than the second refrigeration stop temperature Fa2 and when the temperature R becomes equal to or lower than the second refrigeration stop temperature Ra2.

  INDUSTRIAL APPLICATION This invention can be utilized for the refrigerator which cools the 1st storage room which preserve | saves a frozen thing by the driving | operation of a refrigerating cycle, and the 2nd storage room which preserve | saves the stored thing refrigerated.

DESCRIPTION OF SYMBOLS 1 Refrigerator 1a Heat insulation box 1b Outer box 1c Inner box 2 Refrigeration room (2nd storage room)
2a, 2b, 2c, 3a, 4a, 5a, 6a Door 3 Ice making room 4 Freezer room 5 Freezer room (first storage room)
6 Vegetable room 7 Cooler (first cooler)
8, 18 Blower 9 Foam insulation 11 Cold air passage (first cold air passage)
11a Discharge port 12 Cold air passage (second cold air passage)
12a Discharge port 15 Damper 17 Cooler (second cooler)
26, 56 Temperature sensor 30 Partition wall 50 Machine room 51 Compressor Fa1 First refrigeration stop temperature Fa2 Second refrigeration stop temperature Fb1 First refrigeration start temperature Fb2 Second refrigeration start temperature Ra1 First refrigeration stop temperature Ra2 Second refrigeration stop temperature Rb1 First refrigeration start temperature Rb2 Second refrigeration start temperature

Claims (5)

A first storage chamber that is opened and closed by a first door to store stored items in a frozen state; a second storage chamber that is opened and closed by a second door to store stored items in a refrigerator; a compressor that operates a refrigeration cycle; and the compressor In a refrigerator including a cooling device that generates cold air that is connected to the first storage chamber and the second storage chamber.
When the temperature in the second storage chamber becomes equal to or higher than the predetermined first refrigeration start temperature, the supply of cold air to the second storage chamber is started and the temperature becomes lower than the predetermined first refrigeration stop temperature lower than the first refrigeration start temperature. A normal cooling mode in which the cold air supply to the second storage chamber is stopped when
When the temperature in the second storage chamber becomes equal to or higher than a predetermined second refrigeration start temperature, the supply of cold air to the second storage chamber is started, and the predetermined temperature is lower than the second refrigeration start temperature and higher than the first refrigeration stop temperature. A high-load cooling mode for stopping the supply of cold air to the second storage chamber when the temperature is equal to or lower than the second refrigeration stop temperature;
When the first door is opened for a predetermined first opening time or more and the second door is opened for a predetermined second opening time or more within a predetermined time in the normal cooling mode, the mode is shifted to the high load cooling mode. A refrigerator characterized by that.   2. The refrigerator according to claim 1, wherein the rotation speed of the compressor in the high-load cooling mode is greater than the rotation speed of the compressor in the normal cooling mode.   The refrigerator according to claim 1 or 2, wherein the number of rotations of the compressor is increased when the first door or the second door is opened in the high-load cooling mode.   The refrigerator according to any one of claims 1 to 3, wherein the second refrigeration start temperature is set higher than the first refrigeration start temperature. In the normal cooling mode, the compressor starts to be driven when the temperature in the first storage chamber becomes equal to or higher than a predetermined first freezing start temperature, and the temperature in the first storage chamber is lower than the first freezing start temperature. Stop driving the compressor when the temperature is below a predetermined first freezing stop temperature,
In the high load cooling mode, the compressor starts to be driven when the temperature in the first storage chamber becomes equal to or higher than a predetermined second refrigeration start temperature, and the temperature in the first storage chamber is higher than the second refrigeration start temperature. When the temperature is lower than a predetermined second refrigeration stop temperature that is lower than the first refrigeration stop temperature and lower than the predetermined second refrigeration stop temperature,
The refrigerator according to any one of claims 1 to 4, wherein when the compressor is stopped a predetermined number of times during the high-load cooling mode, the compressor is shifted to the normal cooling mode.

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